Mixing and turbulence producing means for a gas burner tip



L. H. DRAKE 2,776,706

MIXING AND TURBULENCE PRODUCING MEANS FOR A GAS BURNER TIP Jan. 8, 1957Filed Oct. 9, 1953 IN V EN TOR.

Arro/m EY /4 455 H. DRAKE Ting United States Patent MIXING ANDTURBULENCE PRODUCING MEANS FOR A GAS BURNER TIP Lee H. Drake, Columbus,Ohio Application October 9, 1953, Serial No. 385,061 1 Claim. (Cl.158118) This invention relates to improvements in gas burners and isespecially, though not exclusively, designed for use in association withnatural gas burning tips or jets.

A primary object of this invention is to provide a better performing andlonger and larger flame by controlling the admixture of air and gas atthe exit of the gas from a burner tip.

A further object of this invention is to provide a novel means foradmitting and regulating air around the burner tip, the means includinga unit that fits on the burner tip and encompasses it in such a manneras to completely control the admixture of air with the gas issuingtherefrom.

Another object of this invention is to provide a nozzle for the burnertip, the nozzle having an air admitting hood surrounding its end whichis axially spaced from the tip and is formed with corrugated dependentstrips and intermediate axially extending open portions.

These and ancillary objects are attained by this invention, thepreferred embodiments of which are set forth in the followingdescription and illustrated in the accompanying drawing, wherein:

Figure 1 is a side elevational View, partly in section of the mixing andturbulating means, constructed in accordance with this invention;

Figure 2 is a top plan view thereof;

Figure 3 is a cross-sectional view taken on line 3-3 of Figure 1;

Figure 4 is a vertical sectional view;

Figure 5 is a similar vertical sectional view illustrating a modifiedform of corrugated strip, and,

Figure 6 is a perspective view of the lower mounted end of one of thecorrugated strips.

Referring now more particularly to the accompanying drawing, the numeral10 designates a gas conduit, of any conventional type, which terminatesin a tip 12, that controls the flow of gas, preferably natural gas, fromthe conduit. The tip 12 is selected for the size of its centrallydisposed passage 12a to provide the desired gas flow.

A flat plate 14 is formed with a center opening 16 which receives thetip 12 so as to seat the plate 14 on the tip with the plate radiallyprojecting from the tip.

A frusto-conical, hexagonal hood 18 is mounted adjustably on the side 20of the plate and projects outwardly from said side. Preferably, the hoodups-tands from the plate, which is disposed in a horizontal plane. Thehood has its major open end 22 mounted on the side 20, by means of anglebrackets 24 having upstanding, inwardly inclined, apertured flanges 26to receive supporting pins 28. In this fashion, the hood 18 can be movedrelative to the plate 14 to control the admission of air to the tip 12.

The open minor end 30 of the hood 18 is circumposed on a hexagonaltubular member or nozzle 32 and is axially slidable thereon inconformance with the positioning of the major end 22 relative to .theplate. Thus, the hood completely encloses the adjoining ends of thenozzle 32 and tip 12 and is adjustable to admit air between its majorend and the plate.

The nozzle 32 has its lower end portion formed with three axiallyextending, as indicated in Figure 3, openings 34, 36 and 38 inwardly ofthe minor end 38 of the hood. The nozzle has its side walls cut outbelow or inwardly of the minor end of the hood to provide the openings34,

36, and 38. Intermediate the openings 34, 36, and 38, the nozzle hastransversely corrugated dependent strips 40, 42 and 44 which terminatein lateral mounting flanges 46 that are fixedly superimposed byfasteners 48 on the side 20 of the plate. The strips 40, 42 and 44 areundulatingly corrugated, a-sshown in Figure 4, and are equidistantlyspaced apart in angular relation.

If desired, the strips may be outwardly bowed, as is the strip 40a inFigure 5, though such form is not. necessary but does provide :a hotterflame of more stability. The outward strip 40a is easily obtained bymerely bending it outwardly before fastening it to the plate.

The tube or nozzle 32 is preferably formed from brass or copper and thehood 18, which is axially adjustable thereon to regulate the air intakeat 50, is preferably formed from sheet steel. The base or plate 14,which supports the entire unit, is preferably formed from sheet steel.

In use, the tip 12 is selected so that its exit orifice permits thedesired amount of natural gas to issue from the conduit 10. Thecorrugated strips 40, 42 and 44 of the tube 32 are housed within thehood 18, which is axially adjusted to control the size of the air intake50. These strips are the important factors since the performance of theburner dependsupon the corrugations, transverse of the axis of thestrips, which have interposed axially extending openings.

With the hood properly adjusted, the air enters the air intake and mixeswith the ignited gas, the corrugations producing a tu-rbulanm in suchmixture, and a light blue inner tip of flame, which is surrounded by amuch larger and longer flame of dark purple streaked with orange, issuesfrom the nozzle 32. The flame heats metal to a very high red in a veryshort time at a temperature of about 1100 F. I have found that with theflame at such a temperature four inches beyond the nozzle 32, the nozzlenever goes above F., due to the cooling air surrounding it, inwardly ofthe hood.

While the best known form of the invention has been disclosed herein,other forms may be realized so that limitation is sought only inaccordance with the invention as defined in the appended claim.

What I claim is':

A device of the character described comprising a burner fuel supply tiphaving a fuel supply passage extending upwardly therethrough, ahorizontal flat circular plate concentrically mounted and extending fromthe sides of said tip, a vertically extending tubular member forming aburner nozzle, a plurality of circumferentially spaced verticallydependent strips afiixed to the lower end of said tubular member, anoutwardly ext-ending flange formed at the lower end of each strip, saidflange aflixed to said plate in circumferential relationship to saidtip, a plurality of upstanding brackets mounted upon said plate, and ahood having a relatively small upper end slidable upon said tubularmember and a relatively large lower end, and means for verticallyadjustably mounting the lower end of the hood upon said brackets, saidstrips being transvers-ely corrugated.

References Cited in the file of this patent UNITED STATES PATENTS593,364 Moore Nov. 9, 1897 1,217,551 Armor Feb. 27, 1917 1,572,833 BakerFeb. 9, 1926 1,818,471 Geauque Aug. 11, 1931 1,961,572 Roth June 5, 19342,118,741 Smith et al. May 24, 1938 FOREIGN PATENTS 200,974 Ger-manyAug. 3, 1908 643,374 France May 15, 1928

